diff --git a/.env.example b/.env.example
index 56c0eb0..27e4134 100644
--- a/.env.example
+++ b/.env.example
@@ -10,14 +10,14 @@ APP_VERSION=2.0.0
 DEBUG=false
 SECRET_KEY=changez-moi-par-une-valeur-longue-et-aleatoire
 
-# ── Serveur ──────────────────────────────────────────────────
-HOST=0.0.0.0
-PORT=8000
+# ── Serveur (pour dev seulement) ──────────────────────────────
+# HOST=0.0.0.0
+# PORT=8000
 
 # ── Base de données ──────────────────────────────────────────
 # SQLite (dev):  sqlite+aiosqlite:///./data/imago.db
-# PostgreSQL:    postgresql+asyncpg://user:pass@host:5432/imago
-DATABASE_URL=sqlite+aiosqlite:///./data/imago.db
+PostgreSQL:    postgresql+asyncpg://user:pass@host:5432/imago
+# DATABASE_URL=sqlite+aiosqlite:///./data/imago.db
 
 # ── Stockage ─────────────────────────────────────────────────
 # local (fichiers sur disque) ou s3 (MinIO / AWS S3 / Cloudflare R2)
@@ -25,6 +25,7 @@ STORAGE_BACKEND=local
 UPLOAD_DIR=./data/uploads
 THUMBNAILS_DIR=./data/thumbnails
 MAX_UPLOAD_SIZE_MB=50
+SIGNED_URL_SECRET=changez-moi-en-prod
 
 # ── Stockage S3 (si STORAGE_BACKEND=s3) ──────────────────────
 S3_BUCKET=imago
diff --git a/docker-compose.production.yml b/docker-compose.production.yml
index ab3f469..3eea3c1 100644
--- a/docker-compose.production.yml
+++ b/docker-compose.production.yml
@@ -1,12 +1,17 @@
 # Imago — Docker Compose Production
-# Usage: docker compose -f docker-compose.production.yml up -d
+# Usage:
+#   1. Copier .env.example → .env et remplir les secrets
+#   2. docker compose -f docker-compose.production.yml up -d
+#
+# Docker Compose lit automatiquement le fichier .env du répertoire courant.
+# Les variables d'environnement sont référencées avec ${VAR} ou ${VAR:-défaut}.
 
 services:
   # ── Admin Panel (React + Nginx) ───────────────────────────
   admin:
     image: docker-registry.dev.home:5000/imago-admin:latest
     ports:
-      - "3001:80"
+      - "${ADMIN_PORT:-3001}:80"
     depends_on:
       - backend
     restart: unless-stopped
@@ -15,17 +20,18 @@ services:
   backend:
     image: docker-registry.dev.home:5000/imago-backend:latest
     ports:
-      - "8001:8000"
-    env_file: .env.production
+      - "${BACKEND_PORT:-8001}:8000"
+    env_file: .env
     environment:
-      REDIS_URL: redis://redis:6379/0
+      # Connexions internes Docker (hostnames fixes)
       DATABASE_URL: postgresql+asyncpg://imago:imago@db:5432/imago
-      STORAGE_BACKEND: s3
-      S3_ENDPOINT_URL: http://minio:9000
-      S3_BUCKET: imago
-      S3_ACCESS_KEY: minioadmin
-      S3_SECRET_KEY: minioadmin
-      S3_REGION: us-east-1
+      REDIS_URL: redis://redis:6379/0
+      # Variables de l'application (lues depuis .env, défaut local)
+      STORAGE_BACKEND: ${STORAGE_BACKEND:-local}
+      UPLOAD_DIR: ${UPLOAD_DIR:-/app/data/uploads}
+      THUMBNAILS_DIR: ${THUMBNAILS_DIR:-/app/data/thumbnails}
+      MAX_UPLOAD_SIZE_MB: ${MAX_UPLOAD_SIZE_MB:-50}
+      SIGNED_URL_SECRET: ${SIGNED_URL_SECRET:-changez-moi-en-prod}
     volumes:
       - uploads:/app/data/uploads
       - thumbnails:/app/data/thumbnails
@@ -36,19 +42,22 @@ services:
         condition: service_healthy
     restart: unless-stopped
 
+  # ── ARQ Worker ────────────────────────────────────────────
   worker:
     image: docker-registry.dev.home:5000/imago-backend:latest
     command: python worker.py
-    env_file: .env.production
+    env_file: .env
     environment:
-      REDIS_URL: redis://redis:6379/0
       DATABASE_URL: postgresql+asyncpg://imago:imago@db:5432/imago
-      STORAGE_BACKEND: s3
-      S3_ENDPOINT_URL: http://minio:9000
-      S3_BUCKET: imago
-      S3_ACCESS_KEY: minioadmin
-      S3_SECRET_KEY: minioadmin
-      S3_REGION: us-east-1
+      REDIS_URL: redis://redis:6379/0
+      STORAGE_BACKEND: ${STORAGE_BACKEND:-local}
+      UPLOAD_DIR: ${UPLOAD_DIR:-/app/data/uploads}
+      THUMBNAILS_DIR: ${THUMBNAILS_DIR:-/app/data/thumbnails}
+      MAX_UPLOAD_SIZE_MB: ${MAX_UPLOAD_SIZE_MB:-50}
+      SIGNED_URL_SECRET: ${SIGNED_URL_SECRET:-changez-moi-en-prod}
+    volumes:
+      - uploads:/app/data/uploads
+      - thumbnails:/app/data/thumbnails
     depends_on:
       db:
         condition: service_healthy
@@ -56,6 +65,7 @@ services:
         condition: service_healthy
     restart: unless-stopped
 
+  # ── Base de données ───────────────────────────────────────
   db:
     image: postgres:16-alpine
     environment:
@@ -72,6 +82,7 @@ services:
       retries: 5
     restart: unless-stopped
 
+  # ── Redis ─────────────────────────────────────────────────
   redis:
     image: redis:7-alpine
     command: redis-server --appendonly yes --maxmemory 256mb --maxmemory-policy allkeys-lru
@@ -84,6 +95,7 @@ services:
       retries: 3
     restart: unless-stopped
 
+  # ── MinIO (optionnel — utilisé seulement si STORAGE_BACKEND=s3)
   minio:
     image: minio/minio
     command: server /data --console-address ':9001'